Metal wood golf club with variable faceplate thickness

• US 5,318,300 A
• Filed: 11/02/1992
• Issued: 06/07/1994
• Est. Priority Date: 10/16/1990
• Status: Expired due to Term

• Current Assignee: Callaway Golf Company
• Original Assignee: Callaway Golf Company
• Inventors: Helmstetter, Richard C., Schmidt, Glenn H.
• Primary Examiner(s): Millin, Vincent
• Assistant Examiner(s): Wong, Steven B.
• Application Number:
  US07/969,975
• Time in Patent Office: 582 Days
• Field of Search: 273/167 R, 273/167 F-167 H, 273/173, 273/169, 273/78, 273/167A-167 E, 273/167 J-172, 273/175
• US Class Current: 473/305
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0437 with special crown configurations
• CPC Class Codes: A63B 53/045 Strengthening ribs
• CPC Class Codes: A63B 53/0454 Strengthening ribs on the rear surface of the impact face plate
• CPC Class Codes: A63B 53/0458 with non-uniform thickness of the impact face plate
• CPC Class Codes: A63B 53/0462 characterised by tapering thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

A metallic, golf club head having a hollow interior, comprising a ball-striking front wall and the head having walls at the top, bottom, rear, heel and toe of the head; the front wall having variable thickness.

Claims

1. A metallic golf club head having a hollow interior, comprising

a) a ball-striking front wall, and the head having walls at the top, bottom, rear, heel, and toe of the head,

b) said front wall having variable thickness between the heel and toe to transmit golf striking impact forces from the head front wall to said top wall without cracking or buckling of said front wall or top wall,

c) said front wall also having an additional locally rearwardly thickened and bulging portion which extends in a direction toward the heel from a mid-region of the front wall toward and proximate to a peripheral region of the front wall,

d) the locally rearwardly thickened and bulging portion also being metallically integral with said front face directly forwardly of said bulging portion,

e) said head having a shaft receiving tube interiorly of the head and proximate said heel, and located proximate said locally rearwardly thickened and bulging portion.

2. A metallic golf club head having a hollow interior, comprising

a) a ball-striking front wall, and the head having walls at the top, bottom, rear, heel, and toe of the head, said head having a shaft receiving tube interiorly of the head and proximate the heel,

b) said front wall having variable thickness between the heel and toe to transmit golf striking impact forces from the head front wall to said top wall without cracking or buckling of said front wall or top wall,

c) said variable thickness in upper regions of said front wall decreasing from an upper mid-region in a direction toward said toe and from said upper mid-region in a direction toward said heel and directly forwardly of said tube, said upper mid-region being defined by an upper region of said front wall about mid-way between the toe and heel,

d) said front wall also having an additional locally rearwardly thickened and bulging portion which extends in a direction toward the heel from a mid-region of the front wall toward and proximate to a peripheral region of the front wall.

3. The head of claim 2 wherein said variable thickness is measured in vertical planes normal to said front wall and spaced apart between said toe and heel.

4. The head of claim 3 wherein said thickness also locally decreases from a lower mid-region of said front wall in a direction toward said toe.

5. The head of claim 3 wherein said thickness also decreases locally from a lower mid-region of said front wall in a direction toward said heel.

6. The head of claim 2 including a metallic hosel integral with the head and located within the interior thereof and proximate said variable thickness front wall.

7. The head of claim 6 wherein said variable thickness exists at locations proximate a merging interconnection of said front wall and said top wall.

8. The head of claim 7 including

c) a first group of narrow, metallic, shock wave distributing dendrites extending from said variable thickness front wall generally rearwardly adjacent the underside of the top wall and integral therewith,

d) the dendrites spaced apart by amounts greater than their widths, the maximum height dimensions of the dendrites below the underside of the top wall being between 0.050 inches and 0.100 inches and the dendrites being generally downwardly convex in cross-section.

9. The head of claim 8 wherein the front wall also has local thickness substantially greater than the thickness of the top wall, and said dendrites of the first group merge with the inner side of said variable thickness front wall.

10. The head of claim 8 including a second group of narrow metallic dendrites which are integral with said rear wall and extend downwardly at the inner side of said rear wall.

11. The head of claim 10 wherein the dendrites of the second group are located further from the front wall than the dendrites of the first group.

12. The head of claim 7 wherein the dendrites, metallic hosel within the head interior, and said variable thickness front wall all comprise part of a single metallic casting.

13. The head of claim 2 including a group of narrow metallic dendrites which are integral with said rear wall and extend downwardly at the inner side of said rear wall.

14. The head of claim 2 wherein said front wall thickness which diminishes in a direction toward the toe has minimum thickness proximate the toe.

15. The head of claim 2 wherein said front wall thickness, which diminishes in direction toward the heel, has minimum thickness proximate the heel.

16. The head of claim 2 wherein the front wall has a locally rearwardly thickened portion which extends in a direction from a mid-region at said front wall toward a peripheral region of the front wall.

17. The head of claim 2 wherein said rear wall also has variable thickness in directions generally between the heel and toe.

18. The head of claim 2 wherein said front wall thickness locally varies in directions between the toe and heel.

19. The head of claim 18 where said rear wall thickness locally varies in directions generally between the heel and toe.

20. A metallic golf club head having a hollow interior, comprising

a) a ball-striking front wall, and the head having walls at the top, bottom, rear, heel, and toe of the head, said head having a shaft receiving tube interiorly of the head and proximate the heel,

b) said front wall having variable thickness between the heel and toe to transmit golf striking impact forces from the head front wall to said top wall without cracking or bulking of said front wall or top wall,

c) said variable thickness in upper regions of said front wall decreasing from an upper mid-region in a direction toward said toe and from said upper mid-region in a direction toward said heel and directly forwardly of said tube, said upper mid-region being defined by an upper region of said front wall about mid-way between the toe and heel,

d) a metallic hosel integral with the head and located within the interior thereof and proximate said variable thickness front wall and said variable thickness existing at locations proximate a merging connection of said front wall and said top wall,

e) a first group of narrow, metallic, shock wave distributing dendrites extending from said variable thickness front wall generally rearwardly adjacent the underside of the top wall and integral therewith,

f) the endrites spaced apart by amounts greater than their widths, the maximum height dimensions of the dendrites below the underside of the top wall being between 0.050 inches and 0.100 inches and the dendrites being generally downwardly convex in cross-section

g) and a second group of narrow metallic dendrites which are integral with said rear wall and extend downwardly at the inner side of said rear wall, said dendrites of the second group being located further from the front wall than the dendrites of the first group,

h) and wherein the dendrites of the second group also extend beneath said top wall and are spaced apart in a transverse direction, the maximum height dimensions of the second group dendrites being between 0.050 and 0.100 inches.

21. A metallic golf club head having a hollow interior and comprising

a) a ball-striking, upright front wall, and the head having walls at the top, bottom, rear, heel, and toe of the head,

b) said front wall having a locally rearwardly thickened portion which extends in a direction from a mid-region of the front wall toward a peripheral region of the front wall,

c) there being a hosel tube which is within the head and proximate the heel and toward which said locally rearwardly thickened portion closely extends,

d) said front wall also having an additional locally rearwardly thickened and bulging portion which extends in a direction toward the heel from a mid-region of the front wall toward and proximate to a peripheral region of the front wall.

22. The head of claim 21 wherein said thickened portion projects into the hollow interior of the head.

23. The head of claim 22 wherein said thickened portion is rearwardly generally dome-shaped in upright planes which extend rearwardly.

24. The head of claim 21 wherein said locally thickened portion has upright width which progressively increases toward the periphery of the front wall near the heel.

25. The head of claim 24 wherein said locally thickened portion diverges between said front wall mid-region and the heel of the head, and at the rear side of the front wall.

26. The head of claim 21 wherein said front wall has decreasing thickness in a direction from said mid-region toward said toe.

27. The head of claim 26 wherein said front wall has decreasing thickness in a direction from said mid-region toward said heel, and at locations offset from said locally thickened portion.

28. The head of claim 21 wherein said front wall has decreasing thickness in a direction from said mid-region toward said heel, and at locations offset from said locally thickened portion.

29. The head of claim 21 wherein said mid-region of the front wall is near the center of the front wall and at the rear side thereof.

30. The head of claim 21 wherein said mid-region is about half way between the toe and heel, and about half way between the top and bottom walls of the head.

31. The method of casting the head of claim 21 wherein fluid metal is supplied via a zone defined by said locally thickened portion of the front wall to form said head walls including said front wall wherein said metal cools in situ at said walls.

32. In a golf club, of the type including a head and a shaft with a first end, a portion of the shaft proximate said first end being attached to a head, the head comprising a hollow metal shell having a ball striking front wall having a striking surface, a top wall portion, a bottom portion, a toe portion, and a heel wall furthest from said toe portion, said top wall portion being substantially continuous from said toe portion to said heel portion, the improvement comprising:

a) a substantially continuous hollow, metallic tube extending lengthwise along a shell wall from the shell top portion to the shell bottom portion, said tube being integral with and terminating proximate said metal shell top portion and having a bore,

b) the tube bore receiving the shaft,

c) the shaft periphery, connected to the tube bore, and the tube bore having an upper end terminating proximate said shell top portion,

d) the tube integrated with said shell wall so that the shell supports the tube along its length, and whereby metal otherwise required for the tube is used in the shell at locations between the tube and said toe portion,

e) said front wall having variable thickness between the heel portion and the toe portion, and extending directly forwardly of said tube.

33. The improvement of claim 32 wherein said variable thickness extends into proximity to said top wall portion.

34. The improvement of claim 33 wherein said front wall has a locally rearwardly thickened portion which extends in a direction from a mid-region of the front wall toward a peripheral region of the front wall.

35. The improvement of claim 32 wherein said locally thickened portion flares generally toward said tube.

36. The improvement of claim 32 wherein said locally thickened portion is rearwardly generally dome-shaped in upright planes which extend rearwardly.

37. The improvement of claim 32 wherein said front wall has decreasing thickness in a direction from a front wall mid-region toward said toe portion.

38. The improvement of claim 37 wherein said front wall has decreasing thickness in a direction from said mid-region toward said heel portion.

39. The improvement of claim 32 wherein said front wall has decreasing thickness in a direction from a front wall mid-region toward said heel portion.

40. In a golf club, of the type including a head and a shaft with a first end, a portion of the shaft proximate said first end being attached to a head, the head comprising a hollow metal shell having a ball striking front wall having a striking surface, a top wall, a bottom wall, a toe portion, and a heel portion furthest from said toe portion, the improvement comprising:

a) a substantially continuous hollow, metallic, hosel tube extending within said metal shell at the heel portion from the shell top wall to the shell bottom wall, said tube being integral with and terminating proximate said metal shell top wall, and having a bore, said heel portion including a heel wall merged with a rearwardmost extent of said tube,

b) the tube bore receiving a portion of the first end of the shaft, and there being means connecting the shaft periphery to the tube bore,

c) said front wall having variable thickness between said toe portion and said heel portion, said variable thickness decreasing in a direction toward the toe, and in a direction toward the heel to extend directly forwardly of said tube.

41. A method of attaching a metal golf club head to a shaft, comprising the steps of:

a) providing metal golf club head with a top surface, a bottom surface, a front wall having a ball-striking surface with an uppermost extent, a rear surface, a heel portion, a toe portion, and a substantially continuous hollow tube extending between thee top surface, and the bottom surface near the heel portion, said tube being formed to have an upper end terminating proximate the level of said uppermost extent of said striking surface, and proximate an upper most extent of said heel end,

b) forming said front wall to have variable thickness between said toe portion and said heel portion proximate said tube,

c) and inserting the lower end of the shaft into the tube with an adhesive material applied between the exterior surface of the shaft and the interior wall of the tube, the shaft being inserted so that the lower end of the shaft extends proximate said bottom surface,

d) said front wall variable thickness also provided to decrease in a direction toward and into proximity to said tube.

42. The method of claim 41 including forming said front wall to have a locally thickened portion that extends from a mid-region of the front wall generally toward the front wall periphery.

43. The method of claim 42 including connecting said tube with said locally thickened portion of the front wall.

44. The method of claim 41 including forming said front wall to have thickness which decreases between amid-region of the front wall and the toe and heel ends of the head front wall.